that should help.
i'm sure there would be a site out there that keeps historical 5 min charts or something, to look at what the price was at a specific time.
that one only does days if you want to go back further than a week or so.
If it (the spot price) is for the purpose of SMSF PM valuation, my auditor told me it doesn't matter who's spot price you use, as long as you consistently use the same one.